Open-hearth furnace



De 31, 1929- s. TREvER-roN OPEN HEARTH FURNACE Filed Sept. 8I 1927 4Sheets-Sheet gwvemtov TEDHEN TDEVEDTUN 4 l /l ffl,

De :.4 3l, 1929. 5, TREVERTON 1,741,666

OPEN HEARTH FURNACE Filed Sept. 8. 1927 4 Sheets-Sheet 2 e:wwf 1r un31a/vento@ TEDHEN TREVEQTON Guo: nu!

Patented Dec. 31, 192e UNITED STATES PATENT oFFlcE' STEPHEN TnnvnnToN,of oANTON, OHIO, `AssrcfNon To cENTnAL ALLOY STEEL con.-

PORATION, or MAssrnLoN, OHIO, A CORPORATION or NEW Yonx OPEN-Hmm:FURNAGE Appiitauon 111611 separater e, 1927." serial No. 218,233.

The invention relates to open hearth furnaces, having walls made ofrefractory ma-J terial such .as silicious brick, and the object of theinvention is to provide an improved furnace construction enabling arenewable protection of these furnace walls wherever desired as by amaterial such as dolomite preferably applied in the loose form.

. The walls of an open hearth furnace, particularly the front and backwalls, if not provided with adequate renewable lining, are subject todestructive actions due to the chemical and physical condition of themelt in the furnace, which chemical and physical condition may includeamong other things high temperatures and a basic character of the melt,both ofr which have destructive eects,

particularly upon the brick of the furnace walls. 4

Because ofthe above described chemical' and physical conditions of themelt in the furnace, it is particularlynecessary to protect the frontand back walls above the metal line, and attempts have been made toprov' e for the protection of the walls above the metal line by slopingthe walls upwardly -and outwardly at an angle suiiicient to enable aloose-protective lining to rest on the sloping walls by reason of thenormal angle of a. repose of the loose lining.

Such a construction of an open hearth furnace having upwardly andoutwardly eX- tended front and back Walls, is diliicult of attainment ascompared with furnace construction including only a vertical arrangementof the walls, since it lisnecessary to provide angled buckstays forretaining the slopin walls or to greatly increase the quantity o brickrequired to build up'the wall,

40 when the brick is arranged so as to form a sloping interior and avertical exterior.

Another objection to the use of sloping Walls m an open hearth furnacehes m the 'at 1, includes a foundation grillage indicated fact thatdierent lining materials may be used having different angles of repose,and

w clude among other things the provision of an open hearth furnace whichmay be made with substantially vertical walls and which may provide aprotective lining for covering any or all portions of the verticalwalls; and these objects are attained by the use of a constructionincluding a bottom and one or more walls made up of a plurality ofOff-set and substantially vertical heights and a relatively broad, j

Fig. 2, a vertical longitudinal cross section as on line 22, Figs. 3 and4;

Fig. 3, a transverse vertical cross section as on line 3-3, Figs. 1 and2;

Fig. 4, a transverse vertical cross section as on line 4-4, Figs. 1 and2; and

Fig. 5, van enlarged, transverse vertical cross section similar to Fig.4, illustrating a modified embodiment of the invention in an open hearthfurnace having both front and back walls provided with ledge means formaintaining a protective lining.' 4

Similar numerals refer to similar parts throughout the drawings;

The embodiment of the invention illustrated in Figs. 1 to 4 inclusive,is an appli-- cation of the improvementsto an Open hearth furnace forproviding protection to the back wall only.

The improved furnace, indicated generally at 2 and having transversemembers 2 to whichf are Secured at their lower endsvertically extendingfront buckstays 3 and rear buckstays 3pand 3".

Rearbuckstays 3 and 3"- are located opposite front buckstays 3 and theopposite aoy buckstays are connected with each other at their upper endsas by tie rods 4.

` Buckst'ays 3 and 3 as shown, extend upwards in a substantiallyvertical line throughout their entire length.

Rear buckstays 3', however, each include a substantially verticallyextending lower 'strut 3a and a substantially vertical upper strut 3'?)outwardly offset vfrom the lower strut and being connected at its lower.end

lower vertical strut 3'@ of the buckstays 3', a

vertically extending brick wall height 8 is provided, and abutting theoff-set substantially vertical upper struts 3'?) o'f the buckstays 3',an upper vertical brick back wall height 9 is provided and connected atits lower end with the upper end of the wall 8 by a substantiallyhorizontal ledge 10 supported' l by the beams 30.

At the upper ends of the walls 6 and 9 substantially horizontallyextending bearing channels 11 abutting the buckstays 3" and 3 areprovided for transmitting the thrust of.

an arch roof 12.-

Furnace ends 13 and 14 may be provided of any usual construction andconnected with the vertical off-set back wall height 9- as by anledvertically extending walls 15 and 152'.

suitable furnace tap hole 16 may be located in the lower central portionof the back wall 8. The grillage 2 may rest upon a foundation door 17while at the front of the furnace a suitably elevated charging platform18 may be provided.

For protecting the brick furnace bottom and back wall and for formingthe dish-like furnace hearth, the furnace. bottom 5 is renewably coveredwith preferably loose refractory material such asl dolomite or magnesite19, which extends up and beyond the level of the ledge 10 to cover theentire inner surface of the back wall height 9, and being positivelysupported for that purpose by the ledge 10 which may be at or nearthe-metal line of the furnace.

The transverse distance between theA walls '8 and 6 is the normaltransverse distance between the4 front and back walls of open hearthfurnaces which have been used in the past, and in which wall 8 wouldextend vertically to the junction with the roof arch.

by the bottom and the ledge and `For suchv furnaces it has been foundvery' diicultto adequately protect the back wall without unduly cuttingdown the interior volume of the furnacechamber.

It is apparent that by the` use of the present invention, such openhearthl furnaces may be modied with very little diiiculty and pro-.vided with the relatively broad supportin by the use 4of the aforesaidledge and off-set vertical walls.

Where space permits or when building a new furnace, the constructionillustrated in Fig. 5 may be utilized for providing adequate protectionfor both front and back walls of the furnace.

The construction of Fig. 5 is substantially similar to the constructionof Figs. 1 to 4 inclusive with the addition of an outwardly offset upperheight 6a of the front wall connected at its lower end by`asubstantially horizontal ledge 20 with a substantially vertical lowerfront wall height 6b, and supported by the buckstays 3.

The renewable loose dolomite lining 19 in this modification of theinvention ma thus be extended upwards and supported y the' ledges 10 and20 to protect both/the front and back walls of the furnace.

The foregoing arrangement andconstruction of open hearth furnaces havinga renewable lining is very easy and economical to apply to themodification of existing furnaces and to the construction of newfurnaces, and' very materially reduces the maintenance cost of suchfurnaces.

l. An open hearth furnace including? a bottom and a` wall, the wallincluding a plurality of oH-set and substantially vertical heights and asubstantiall horizontal ledgebetween the separate heig ts near thenormal metal line.

2.1n open hearth furnace including a bottom and a wall, the wallincluding a plurality of off-set and substantially vertical heights, asubstantially horizontal ledge between the separate heights near thenormal metal line, f

and a lining material supported by the bot.-

tom and the ledge and covering portions of the vertical heights.

. 3. An open hearth furnace including a bottom and walls, each wallincluding aplurality of off-set and substantiall heights, asubstantially horizontal ledge between the separate heights near thenormal metal line, and a lining material supported entirely covering thevertical heights.

vertical 4. An openhearth furnace including a, bottom and a wall,`thewall including a plurality of olf-set heights, ezich of Whose innerfaces is substantially vertical,"y substantially horizontal ledgebetween thel off-set heights near the normal metal line, and a`f1iningmaterial supported by the bottom and the ledge and entirely covering theinner faces o f the offset heights.

In testimony whereof I 'ailix m signature. STEPHEN TRE ERTONQ i

